Year	per 1,000 people
1960	22.4
1961	22.9
1962	22.1
1963	21.5
1964	20.5
1965	19.6
1966	19.8
1967	19.4
1968	20.1
1969	20.4
1970	20.6
1971	21.4
1972	20.1
1973	18.5
1974	17.8
1975	16.7
1976	16.2
1977	15.9
1978	15.6
1979	15.3
1980	15.3
1981	15.7
1982	15.8
1983	15.8
1984	15
1985	15.7
1986	15
1987	15.4
1988	14.9
1989	14.9
1990	15.4
1991	14.9
1992	15.1
1993	14.7
1994	14.5
1995	14.2
1996	13.9
1997	13.6
1998	13.3
1999	13.1
2000	13
2001	12.7
2002	12.8
2003	12.6
2004	12.3
2005	12.8
2006	12.9
2007	14.1
2008	14
2009	13.9
2010	13.7
2011	13.6
2012	13.7
2013	13.3
2014	13.2
2015	12.9
2016	12.9
2017	12.6
2018	12.6
2019	12.1
2020	11.5
2021	12.1
2022	11.6